DE102013018564B4 - Valve control device and process valve - Google Patents

Abstract

Valve control device for a process valve (1) with control electronics (33) for controlling a drive (15) and a measuring system (34) for determining the position of an element located inside the valve control device (22) and moving along a rectilinear movement direction (B) therein (32), characterized in that the measuring system (34) comprises a transmitting arrangement (35) for emitting an electromagnetic excitation wave, a resonator (36) attached to the movable element, in which a resonant electrical oscillation is generated by the excitation wave, 37), in which an electromagnetic resonance wave (R) generated by the resonant electrical oscillation generates a signal, and a measuring electronics (38) connected to transmitting arrangement (35) and receiving arrangement (37), which are used to generate the excitation wave in the transmitting arrangement (35). and determining the position of the movable member (32) relative to the receiving assembly (37) from the signal of the receiving arrangement (37) is arranged, wherein the resonator (36) is designed and arranged such that the electromagnetic resonance wave (R) rotationally symmetrical to a longitudinal axis (L) and the longitudinal axis (L) on the Direction of movement (B) is aligned.

Description

The invention relates to a valve control device for a process valve according to the preamble of claim 1 and a process valve according to the preamble of claim 22.

Process valves in the process plants of the food, beverage and pharmaceutical industries as well as the fine chemical industry and biotechnology are integrated into complex plant controls. For this purpose, a valve control device is arranged on the process valve, which is connected to the system controller. The valve control device notifies the position of the process valve to the system controller and changes the signals to the valve position as soon as the process requires it.

The position of the process valve was determined in previous mechanical contact solutions. Microswitch and a component of the valve connected to a closing element touched each other. The component was designed so that the switching position of the microswitch was changed by moving the component. The position of the closing element could thus be determined. Since this type of position determination was susceptible to wear, non-contact measuring methods were developed and successfully brought to the market.

Non-contact measuring methods are virtually wear-free on their own and have the advantage of being able to carry out a calibration in the case of mechanical wear of valve parts, in particular the seal between valve disk and valve seat. With this, for example, the closed position is determined even if this is achieved due to the aging of the seal in an altered position of the valve disk and valve seat to each other. Such a calibration method without further explanation of the non-contact measuring principle is for example in the WO 95/17624 A1 described.

The WO 02/093058 A1 presents both a calibration method and the device for non-contact measurement of the valve position. For position measurement, a plurality of Hall sensors are used, which is arranged along the direction of movement of a connected to a valve disc moving valve rod permanent magnet.

Yet another arrangement for non-contact measurement in a process valve explains the DE 10 2007 058 253 A1 , A permanent magnet is attached to the valve stem and cooperates with a magnetostrictive sensor.

The WO 95/31 696 A1 suggests a position measurement in which the position of a resonant circuit constructed of a coil and a capacitor relative to a coil arrangement extending in a plane is determined. The coil arrangement is designed so that a sinusoidal magnetic sensitivity along the direction of movement of the resonant circuit results.

The DE 698 10 504 T2 discloses a device for use in a position sensor that detects the relative position between at least two relatively movable elements. The device is applicable to inductive linear and rotary position encoders. The device comprises, in particular, looped conductor tracks which are arranged in multiple layers.

The DE 20 2014 102 940 U1 was filed after the filing date of the present application and relates to a valve with a plunger and a sensor. With the help of the sensor, the position of a signal generator is determined, which includes a coil. Its coil axis is substantially parallel to the axis of the plunger.

The DE 198 07 593 A1 presents a distance measuring device and a method for determining a distance. It is proposed to design a sensor with a resonator in the form of a cavity resonator.

The non-contact measurement principles known in the prior art, in particular based on Hall sensors, have been successfully used on the market for years. However, the absolutely necessary, very high reliability requires a complex construction, resulting in high costs for the valve controls.

It is therefore an object of the invention to provide a valve control device for a process valve, which achieves a high reliability with a cost-effective design.

This object is achieved by a valve control device for a process valve having the features of claim 1 and a process valve having the features of claim 22. The dependent claims 2 to 21 and 23 and 24 indicate advantageous developments of the valve control device and the process valve.

A valve control device, which is set up for interaction with a process valve, comprises control electronics for controlling a drive and a measuring system for determining the position of an element located within the valve control device and movable therein along a rectilinear movement direction.

The measuring system of a valve control device for a process valve comprises a A transmitting arrangement for emitting an electromagnetic excitation wave, a resonator attached to a movable element in which a resonant electrical oscillation is generated by the excitation wave, a receiving arrangement in which an electromagnetic resonance wave generated by the resonant electrical oscillation generates a signal, and a transmitting array and Receiving arrangement connected measuring electronics, which is set up for generating the excitation wave in the transmission arrangement and for determining the position of the movable element relative to the receiving arrangement of the signal of the receiving arrangement. As a result, components are avoided that are costly to protect against shocks and temperature effects, or in itself have a high reliability, but are increasingly expensive, such as permanent magnets. Instead, the components of the measuring system are robust and inexpensive at the same time, so that high reliability is achieved cost-effectively. The use of a principle with excitation wave and resonance wave also ensures a clean separation of useful signals and interspersed noise. This increases the reliability of the measurement.

A first advantageous development provides that the resonator is designed and arranged such that the electromagnetic resonance shaft are rotationally symmetrical to a longitudinal axis and the longitudinal axis aligned with the direction of movement. This increases the reliability, since a precise position measurement is possible even when the resonator rotates about its longitudinal axis.

In a next development transmission arrangement and receiving arrangement are designed flat and aligned a measuring path covering the direction of movement. This is possible with a cost-effective and technically simple production, for example as a printed multilayer circuit. This in turn has an advantageous effect on reliability and costs.

Another development to increase the aforementioned advantages suggests that a first electrical connection and a second electrical connection between control electronics and measuring electronics are provided. So that the circuit complexity is reduced and a low cost for the production interface between the circuit parts are achieved, the first electrical connection for supplying the measuring electronics with an operating voltage and the second electrical connection for transmitting a position signal are set. For example, a cable with only three wires is sufficient to provide first and second electrical connection.

The component costs are particularly low and the reliability is particularly high if, according to a next development, the transmitting arrangement comprises an electrical transmitting coil and the receiving arrangement comprises an electrical receiving coil.

The aforementioned development can in turn be developed by the signal generated in the receiving coil by the resonance wave is an induction voltage whose size depends on the position of the movable element. This is a particularly easy-to-handle measure, which reduces the complexity of circuitry, increasing reliability and cost benefits.

A higher accuracy of the measurement is achieved if the receiving arrangement comprises a first receiving coil and a second receiving coil.

A development of this idea is that the receiving coils are arranged so that the signals in the first and second receiving coil are out of phase with each other. The accuracy of the measurement is increased again.

The mechanical reliability is increased by arranging transmission arrangement and receiving arrangement in a measuring system housing according to further development.

The structure of the valve control device is simplified by the control electronics is mechanically connected to the measuring system housing.

A due to short signal paths for the measurement signal between the receiving device and necessary processing electronics reliability enhancing training provides that the measuring electronics is disposed in the measuring system housing.

A simple and robust construction of the resonator results if, according to a further development, the resonator comprises an electrical resonant circuit.

A reliable structure of the resonator, which increases the reliability of the measurement by the rotation degree of freedom, according to training, that the resonator comprises a resonant circuit with a resonance coil, which is designed and arranged such that the electromagnetic resonance shaft rotationally symmetrical to a longitudinal axis and the longitudinal axis the direction of movement is aligned.

The reliability is improved by increased robustness, if according to the development of the resonance coil fluid-tight in an encapsulation is enclosed, and the enclosure has a central passage opening.

An advantageous gas guide within the valve control device is achieved when the passage opening is arranged to cooperate with a pressure medium channel for supplying a drive with a pressure medium.

The leadership of the pressure medium on the one hand and the robustness on the other hand are improved by the mobile element is arranged in a cup-shaped housing according to the development, which is open to a connectable to the drive coupling flange of the valve control device.

A space-saving design of the components of the valve control device is achieved when the control electronics is mechanically connected to a bottom of the cup-shaped housing.

According to a development of the valve control device, the control electronics are operatively connected to at least one control valve. As a result, a simple control of a drive can be achieved.

A particularly favorable guidance of the pressure medium is achieved if, according to a further development, the control valve is connected to a passage through which a pressure medium can be admitted into the cup-shaped housing.

The valve control device for a process valve can be further developed by the control electronics comprising a light source, which cooperates with a transparent housing portion of the valve control device as a visual display means. The control electronics acts in this way in simplification of the structure itself as a supporting component for the lamp, which allows the display of the valve position independently of other tools.

Another development provides that the control electronics comprises storage means for storing valve parameters. In this way, data obtained during operation can be stored in the valve controller. They are available to detect changes and, if necessary, to take into account or to report them. Such changes may result from contamination, wear or otherwise caused deviations from the normal operation of the process valve and have an influence on the valve position.

The control of the process valve by means of a process plant control requires a communication circuit in the valve control device. In order to keep the number of assemblies within the valve control device small, it is advantageous if the control electronics comprises a communication circuit.

The invention also provides a process valve, in particular the food or pharmaceutical industry and biotechnology, according to claim 22. The cooperation with a valve control device according to any one of claims 1 to 21 provides a process valve which operates safely under process conditions such as high temperatures and wear-promoting media due to the reliable measurement of valve position.

A favorable in terms of manufacturing costs and reliability arrangement of the components of the process valve to each other is given according to a development, when the drive between the process valve and valve control device arranged and a drive rod is provided, which passes through the drive and is connected to the obturator and the movable member.

According to a development of the process valve, it is provided that the drive rod comprises a pressure medium channel which starts at a rod end facing the movable element and ends inside the drive. This provides a compact structure in which a critical component is disposed within the valve components and so safety is increased.

Reference to an embodiment and its developments, the invention will be explained in more detail and the representation of the effects and benefits to be deepened. Show it:

1 : Schematic representation of a process valve with a valve control device;

2 : Section through a valve control device shown schematically according to 1 ;

3 : Schematic representation of the measuring system, the movable element and the electronic components of the valve control device according to the 1 and 2 ;

4 : Section through the resonator arranged on the movable element with representation of the magnetic field component of the resonance wave.

In 1 is a schematic, partially sectioned view of a process valve 1 which is suitable for the food, beverage, fine chemical and pharmaceutical industries as well as biotechnology. The process valve 1 has a valve body 2 which, for example, a first, second, third and fourth connection 3 . 4 . 5 and 6 having. First and second connection 3 and 4 create a fluid connection to a first chamber 7 of the process valve 1 , third and fourth connection 5 and 6 corresponding to a fluid connection to a second chamber 8th , Each of the connections can be connected to a pipeline of a process plant. Inside the valve housing 2 is between first and second chamber 7 and 8th a passage opening 9 provided which of a valve seat 10 is surrounded. A shut-off device 11 is arranged so that it is with the valve seat 10 in sealing contact can be brought to the through the passage opening 9 formed compound from first to second chamber 7 and 8th to interrupt and in this way a closed position of the process valve 1 to accomplish. Furthermore, the obturator 11 arranged so that the contact can be released to the connection from first to second chamber 7 and 8th release. Depending on the required sealing effect can on the obturator 11 a shut-off seal 12 be provided, which with the valve seat 10 cooperates sealingly in the closed position.

With the obturator 11 is for example a one-piece or multi-part drive rod 13 connected. An implementation 14 seals the passage at which the drive rod 13 the valve housing 2 interspersed. The drive rod 13 intersperses a drive 15 and is at its point of entry and exit by means of a lower and upper drive seal 16 and 17 sealed.

Inside the drive 15 is a piston 18 with the drive rod 13 connected. By means of a piston seal 19 is the piston 18 against the housing of the drive 15 sealed. A feather 20 causes the movement of the piston 18 along the direction of movement B in a first direction. A pressure medium in a pressure chamber 21 acts against the force of the spring 20 and causes the movement of the piston 18 along the direction of movement B opposite the first direction. With the movement of the piston 18 there is a movement of the drive rod 13 and thus also the obturator 11 , The contact between valve seat 10 and obturator 11 can be created or canceled accordingly. If the contact is canceled, the open position of the valve is reached, in which a fluid connection between the first chamber 7 and second chamber 8th consists.

On the valve body 2 opposite side of the drive 15 is a valve control device 22 arranged and with the drive 15 releasably connected. To create this connection, the drive points 15 a drive flange 23 on. The valve control device 22 in turn has a coupling flange 24 , which with the drive flange 23 by means of a clamp 25 or another suitable connection means. The flange connection is pressure-sealed. This is a flange seal 26 on the coupling flange 24 intended. Alternatively, the flange seal 26 on the drive flange 23 or both in drive flange 23 and coupling flange 24 as it were arranged engaging.

The drive rod 13 For example, and advantageously has a pressure medium channel 27 whose main section is designed, for example, in the form of a bore along its axis. This pressure medium channel 27 connects the valve control device 22 with the pressure room 21 , so that pressure medium from the valve control device 22 in the drive 15 passes and causes its position change. This saves external pressure medium guides, which represent a source of error, for example, by breaking up brittle lines.

In 2 is a section through the valve control device 22 shown with schematically illustrated electronic components. The valve control device 22 owns a base 28 to which the coupling flange 24 is fixed, with which the valve control device 22 with the drive 15 with the help of the flange gasket 26 is sealed connected. A hood 29 is with the base 28 releasably connected and covers the functional components of the valve control device 22 from, for example, the electronic components.

The rod end 30 the drive rod 13 passes through the center of the coupling flange 24 and protrudes into the interior of a cup-shaped housing 31 , This is at the base 28 attached and preferably sealed there. At the end of the pole 30 is a moving element 32 attached, which related to the rod end 30 stationary and based on the cup-shaped housing 31 is mobile. Although the movable element 32 one-storey with the drive rod 13 be carried out, however, the division is advantageous for the production, since in this way the movable element 32 with the different drive rods 13 different valve types can be combined.

The valve control device 22 has in its interior an electronic control system 33 with which the drive 15 is controlled to determine and change the valve position. It also has a measuring system 34 for determining the valve position.

The measuring system 34 includes a transmission arrangement 35 with which an electromagnetic excitation wave is emitted, which may be continuous, modulated or pulsed. This excitation wave generates a resonant oscillation in a resonator 36 , which at the mobile element 32 is provided. This resonant oscillation, in turn, generates an electromagnetic resonance wave R emitted by the resonator 36 sent out and by means of a receiving arrangement 37 Will be received.

The drive 15 causes a movement of the movable element 32 along the straight line movement B. The design of drive 15 and process valve 1 determine the stroke of the process valve, whereby a necessary measurement path M is also defined, along which the resonator 36 can move. transmitting arrangement 35 and receiving arrangement 37 are designed so that with their help the position of the resonator 36 in relation to the measuring path M can be determined.

A measuring electronics 38 is designed such that it generates the necessary electrical signal with which the transmitting device 35 is operated. The measuring electronics 38 is further configured so that they by the electromagnetic resonance wave R in the receiving device 37 generated currents and voltages processed into a position signal and generates a signal which is a measure of the position of the resonator 36 with respect to the receiving arrangement 37 is.

The measuring system 34 with transmission arrangement 35 , Reception arrangement 37 and measuring electronics 38 includes a measuring system housing 39 , with which advantageously a module is created, which the positioning of the measuring system 34 within the valve control device 22 on the one hand and its mounting on the other hand much easier.

A particularly compact design is achieved because the control electronics 33 with screws 40 or another fastener on the ground 41 the cup-shaped housing 31 and on the measuring system housing 39 is attached. This structure also allows a light source 42 on the control electronics 33 to arrange, which with a transparent housing section 43 interacts. This is designed, for example dome-shaped, so that the bulb 42 emitted signal light is visible in a large solid angle.

control electronics 33 and measuring electronics 38 are by means of a measuring connection 44 electrically connected. The measuring connection 44 is used in particular for the transmission of the position of the movable element 32 in relation to the receiving arrangement 37 representing signal.

Within the valve control device 22 is a control valve 45 arranged. The open or closed switching state of this control valve 45 is through the control electronics 33 by means of a switching connection 46 set.

The control valve 45 is on the one hand with a pressure medium supply 47 connected, on the other hand with a passage 48 in the cup-shaped housing 31 , With open control valve 45 flows pressure medium from the pressure medium supply through the control valve 45 and the passage 48 in the cup-shaped housing 31 , A passage opening 49 interspersed with moving element 32 and resonator 36 and creates a fluid connection between the interior of the cup-shaped housing 31 and the pressure medium channel 27 , In the open position of the control valve 45 flows pressure medium in the pressure medium channel 27 one in the pressure room 21 of the drive 15 ends. The pressure medium causes a displacement of the piston 18 against the force of the spring 20 and a total of movement of the obturator 11 from the valve seat 10 away, leaving the process valve 1 in the open position, in which a fluid connection between the first chamber 7 and second chamber 8th consists.

Based on the schematic representation in 3 should the functional structure of the transmission arrangement 35 , the reception arrangement 37 and the control electronics 33 be explained in more detail.

The transmission arrangement 35 includes a flat transmission coil 50 , which extends over the length of the measuring path M. The transmitting coil 50 may comprise one or more conductor loops, which may advantageously be embodied as printed conductors on a printed circuit board.

The receiving arrangement 37 includes a first receiving coil 51 and a second receiving coil 52 , Both receiver coils 51 and 52 are flat and advantageous designed as traces on a printed circuit board. First receiver coil 51 and second receiving coil 52 are sized so that the receiving arrangement 37 extends over the measuring path M.

The spools 50 . 51 and 52 can be part of a common, multi-layer printed circuit. This allows a very favorable production and at the same time causes a vibration-proof orientation of the coils 50 . 51 and 52 to each other. This increases the reliability of the measuring system 34 , Particularly compact is the arrangement when the coils 50 . 51 and 52 one above the other, for example, in a layer structure according to the DE 69 810 504 T2 ,

First receiver coil 51 and second receiving coil 52 are electronically out of phase with each other. This is in the 3 causes and illustrated by conductor loops. The first receiver coil 51 includes two conductor loops 53a and 53b , both of which have an equal extension in the direction of movement B and lie along the direction of movement B in series one behind the other. The second receiver coil 52 has three conductor loops along the direction of movement B. A middle conductor loop 54b has a greater extent than the two outer conductor loops 54a and 54c , where the dimensions of these two conductor loops 54a and 54c are the same. This design of the first receiver coil 51 and second receiving coil 52 causes for a given position of the resonator 36 in that of the resonant wave R in the conductor loops 53a and 53b respectively. 54a . 54b and 54c generated induction in the receiver coils 51 and 52 is different in size. From this, the position of the resonator can be determined by measuring the induction intensity, for example by forming the ratio of the induction strengths 36 derived.

Number of conductor loops 53a . 53b . 54a . 54b and 54c , Shape and number of turns depend on the available signal strength of the resonant wave R and the desired spatial resolution and vary accordingly over the example shown. Further design aspects of the coils 50 . 51 and 52 arise from the DE 69 502 283 T2 ,

The receiver coils 51 and 52 are with the measuring electronics 38 connected, so that each induced voltages in the electronic circuits of the measuring electronics 38 are available for further processing, for example, said ratio formation. A circuit of the measuring electronics 38 is for energizing the transmitter coil 50 connected to this.

The control electronics 33 includes a supply circuit 55 , This generates the operation of the components of the control electronics 33 and measuring electronics 38 necessary voltages and currents. The measuring electronics 38 is connected to the supply circuit by means of a first electrical connection 56 connected.

A control circuit 57 the control electronics 33 is connected by a second electrical connection 58 to the measuring electronics. This connection transmits a signal indicating the position of the resonator 36 and thus the obturator 11 represents. This can be a digital value or an analog voltage.

A communication circuit 59 is in the control electronics 33 intended. This communication circuit 59 serves to, by means of a communication connection 60 to exchange control commands and position signals with an external device, for example a process control system. This replacement includes the feedback of the valve position to the process plant controller and the command, the process valve 1 to open or close. Such a command is issued by the control circuit 57 in a necessary energization of the control valve 45 implemented, with which the control circuit 57 via the switch connection 46 connected is.

In the control electronics 33 is a storage medium 61 provided, which with the control circuit 57 is connected so that there position values can be stored, for example, position values of the obturator 11 in the open position and closed position of the process valve 1 , This storage means 61 can for the procedure after the WO 02/093058 A1 be used.

First and second electrical connection 56 and 58 together advantageously form the measuring connection 44 and are designed as a three-core or vieradriges cable. As a result, a particularly simple arrangement of control electronics 33 and measuring system 34 achieved, which is very failsafe mountable due to the few contacts and cables.

An embodiment of the resonator 36 is in 4 shown in section. The moving element 32 is at the bar end 30 the drive rod 13 or attached to this connected part. rod end 30 and movable element 32 are shaped according to this example so that they have a screw connection 62 form. This is a cylindrical extension 63 with external thread in an internally threaded recess 64 added. By example, the cylindrical extension 63 on the moving element 32 arranged during the recess 64 at the end of the pole 30 is provided. A mirrored arrangement is also possible in the recess 64 on the moving element 32 and the cylindrical extension 63 at the end of the pole 30 are arranged. Compared to other also possible non-positive, positive or cohesive connections of rod end 30 and movable element 32 the screw connection is particularly easy to install. In addition to the screw connection can be an additional connection 68 be created by the two parts of the movable element are connected together. This is preferably designed to be difficult to detach and can be based on force or positive locking. Hard to detach in this context means that it is on the one hand dismantled but on the other hand is not solved during operation of the process valve. Such an additional connection 68 makes it possible to use a few components to adapt a movable element which can be adapted to many different valve types 32 to accomplish.

The resonator 36 is designed as an electrical resonant circuit and includes an electrical coil 65 , The windings of the electric coil 65 are about a longitudinal axis L of the movable element 32 wrapped around. In particular, the electric coil 65 wound so that the resonance wave R results, which is rotationally symmetrical to the longitudinal axis L. A rotation of the moving Elements 32 Therefore, about its longitudinal axis L does not lead to a measurable change of the signal in the receiving arrangement 37 , As a result, the reliability of the measurement and thus the entire process valve 1 increased, since one in the operation of the process valve 1 resulting twisting does not affect the measurement. Such a twist can, for example, by the obturator 11 from the funded fluid forces or by torsional moments of the spring 20 on the piston 18 into the moving element 32 be initiated. To illustrate the symmetry of the resonance wave R is in 4 the magnetic field component indicated schematically as a dashed line.

The resonant circuit includes in addition to the electrical coil 65 a capacitor 66 , Preferably, the electrical coil 65 and the capacitor 66 protected against encapsulation by, for example, corrosive constituents contained in the pressure medium. This can advantageously inexpensive and mechanically stable than potting 67 be executed.

The moving element 32 has a central passage opening 49 on which the electric coil 65 and the encapsulation also centrally interspersed. The passage opening 49 is in fluid communication with the pressure medium channel 27 in the cylindrical extension 63 of the rod end 30 ends, and acts with the pressure medium channel 27 to supply the drive ( 15 ) with a pressure medium together.

The direction of movement B of the movable element 32 is at construction of the valve 1 and the valve control device 22 established. It can, for example, according to construction perpendicular to the through the valve seat 10 and / or the coupling flange 24 standing through the plane. The longitudinal axis L of the movable element 32 and thus the axis of symmetry of the resonance wave R are constructively merged with the direction of movement B or designed at least parallel. Due to component tolerances or wear, the actual movement may be tilted against this constructively defined, so to speak planned, direction of movement B. This corresponds to an angle W, which is set between the longitudinal axis L and the direction of movement B.

This is typically at values of two degrees or less. transmitting arrangement 35 , Reception arrangement 37 and measuring electronics 38 are designed so that the determination of the position of the movable element 32 even with a deviation by the angle W takes place.

Alternatively to the embodiment of the process valve shown here 1 This can be a different number of connections 3 . 4 . 5 and 6 exhibit. It can be next to the shut-off seal 12 included more seals and be designed as a double-seat valve and therefore next to the obturator 11 have further shut-off. Other embodiments are familiar to the expert, for example, the execution as a tank bottom valve.

LIST OF REFERENCE NUMBERS

1

process valve

2

valve housing

3

first connection

4

second connection

5

third connection

6

fourth connection

7

first chamber

8th

second chamber

9

Through opening

10

valve seat

11

shutoff

12

Sealing device

13

drive rod

14

execution

15

drive

16

lower drive seal

17

upper drive seal

18

piston

19

piston seal

20

feather

21

pressure chamber

22

Valve control device

23

drive flange

24

coupling flange

25

clamp

26

flange

27

Pressure fluid channel

28

Base

29

Hood

30

rod end

31

cup-shaped housing

32

movable element

33

control electronics

34

measuring system

35

transmitting arrangement

36

resonator

37

receiving arrangement

38

measuring electronics

39

Measuring system housing

40

securing means

41

ground

42

Lamp

43

transparent housing section

44

measuring connection

45

control valve

46

interconnection

47

Pressure medium supply

48

passage

49

Through opening

50

transmitting coil

51

first receiver coil

52

second receiver coil

53a

conductor loop

53b

conductor loop

54a

conductor loop

54b

conductor loop

54c

conductor loop

55

supply circuit

56

first electrical connection

57

control circuit

58

second electrical connection

59

communication circuit

60

communication link

61

storage means

62

screw

63

cylindrical extension

64

recess

65

resonance coil

66

capacitor

67

encapsulation

68

additional connection

L

longitudinal axis

B

movement direction

R

resonant wave

W

intermediate angle

M

Measuring path

Claims (24)

Valve control device for a process valve ( 1 ) with a control electronics ( 33 ) for controlling a drive ( 15 ) and a measuring system ( 34 ) for determining the position of a within the valve control device ( 22 ) and therein along a rectilinear movement direction (B) movable element ( 32 ), characterized in that the measuring system ( 34 ) a transmission arrangement ( 35 ) for emitting an electromagnetic excitation wave, a resonator attached to the movable element (US Pat. 36 ) in which a resonant electrical oscillation is generated by the excitation wave, a receiving arrangement ( 37 ) in which an electromagnetic resonance wave (R) generated by the resonant electrical oscillation generates a signal, and one with transmitting arrangement ( 35 ) and receiving arrangement ( 37 ) connected measuring electronics ( 38 ), which is used to generate the excitation wave in the transmission arrangement ( 35 ) and to determine the position of the mobile element ( 32 ) relative to the receiving arrangement ( 37 ) from the signal of the receiving arrangement ( 37 ), wherein the resonator ( 36 ) is designed and arranged such that the electromagnetic resonance wave (R) is oriented rotationally symmetrically with respect to a longitudinal axis (L) and the longitudinal axis (L) is aligned with the direction of movement (B). Valve control device for a process valve ( 1 ) according to claim 1, characterized in that transmission arrangement ( 35 ) and receiving arrangement ( 37 ) and a measuring path (M) covering the direction of movement (B) are aligned. Valve control device for a process valve ( 1 ) according to one of the preceding claims, characterized in that a first electrical connection ( 56 ) and a second electrical connection ( 58 ) between control electronics ( 33 ) and measuring electronics ( 38 ), the first connection ( 56 ) for supplying the measuring electronics ( 38 ) with an operating voltage and the second electrical connection ( 58 ) are set up for the transmission of a position signal. Valve control device for a process valve ( 1 ) according to one of the preceding claims, characterized in that the transmission arrangement ( 35 ) an electric transmission coil ( 50 ) and the receiving arrangement ( 37 ) an electrical receiver coil ( 51 . 52 ). Valve control device for a process valve ( 1 ) according to claim 4, characterized in that in the receiving coil ( 51 . 52 ) signal generated by the resonant wave (R) is an induction voltage whose magnitude depends on the position of the movable element ( 32 ) is dependent. Valve control device for a process valve ( 1 ) according to claim 4 or 5, characterized in that the receiving arrangement ( 37 ) a first receiving coil ( 51 ) and a second receiving coil ( 52 ). Valve control device for a process valve ( 1 ) according to claim 6, characterized in that the first receiving coil ( 51 ) and second receiving coil ( 52 ) are arranged so that the signals in the first and second receiving coil ( 51 . 52 ) are out of phase with each other. Valve control device for a process valve ( 1 ) according to one of the preceding claims, characterized in that transmission arrangement ( 35 ) and receiving arrangement ( 37 ) in a measuring system housing ( 39 ) are arranged. Valve control device for a process valve ( 1 ) according to claim 8, characterized in that the control electronics ( 33 ) mechanically with the measuring system housing ( 39 ) connected is. Valve control device for a process valve ( 1 ) according to claim 8 or 9, characterized in that the measuring electronics ( 38 ) in the measuring system housing ( 39 ) is arranged. Valve control device for a process valve ( 1 ) according to one of the preceding claims, characterized in that the resonator ( 36 ) an electrical resonant circuit ( 65 . 66 ). Valve control device for a process valve ( 1 ) according to one of the preceding claims, characterized in that the resonator ( 36 ) a resonant circuit ( 65 . 66 ) with a resonance coil ( 65 ) which is designed and arranged such that the electromagnetic resonance wave (R) is oriented rotationally symmetrically with respect to a longitudinal axis (L) and the longitudinal axis (L) is aligned with the direction of movement (B). Valve control device for a process valve ( 1 ) according to claim 12, characterized in that the resonance coil ( 65 ) fluid-tight in an encapsulation ( 67 ) and the encapsulation ( 67 ) a central passage opening ( 49 ) owns. Valve control device for a process valve ( 1 ) according to claim 13, characterized in that the passage opening ( 49 ) with a pressure medium channel ( 27 ) for the supply of the drive ( 15 ) is arranged cooperatively with a pressure medium. Valve control device for a process valve ( 1 ) according to one of the preceding claims, characterized in that the movable element ( 32 ) in a cup-shaped housing ( 31 ), which is to one with the drive ( 15 ) connectable coupling flange ( 24 ) of the valve control device ( 22 ) is open. Valve control device for a process valve ( 1 ) according to claim 15, characterized in that the control electronics ( 33 ) with a floor ( 41 ) of the cup-shaped housing ( 31 ) is mechanically connected. Valve control device for a process valve ( 1 ) according to one of the preceding claims, characterized in that the control electronics ( 33 ) with at least one control valve ( 45 ) is operatively connected. Valve control device for a process valve ( 1 ) according to claim 17, characterized in that the control valve ( 45 ) with a passage ( 48 ) is connected, through which a pressure medium in the cup-shaped housing ( 31 ) is einlassbar. Valve control device for a process valve ( 1 ) according to one of the preceding claims, characterized in that the control electronics ( 33 ) a light source ( 42 ), which with a transparent housing section ( 43 ) of the valve control device ( 22 ) cooperates as a visual display means. Valve control device for a process valve ( 1 ) according to one of the preceding claims, characterized in that the control electronics ( 33 ) a storage means ( 61 ) for storing valve parameters. Valve control device for a process valve ( 1 ) according to one of the preceding claims, characterized in that the control electronics ( 33 ) a communication circuit ( 59 ). Process valve ( 1 ) of the food or pharmaceutical industry and biotechnology with a passage ( 9 ) and a shut-off device ( 11 ), with which a blocking position and a passage position of the process valve ( 1 ), a drive ( 15 ) for moving the obturator ( 11 ) between blocking position and passage position, characterized in that the obturator ( 11 ) with the movable element ( 32 ) a valve control device ( 22 ) is connected directly or indirectly according to one of the preceding claims. Process valve ( 1 ) according to claim 22, characterized in that the drive ( 15 ) between process valve ( 1 ) and valve control device ( 22 ) and a drive rod ( 13 ) is provided, which the drive ( 15 ) and with the obturator ( 11 ) and the movable element ( 32 ) connected is. Process valve ( 1 ) according to claim 23, characterized in that the drive rod ( 13 ) a pressure medium channel ( 27 ), which on a the movable element ( 32 ) facing rod end ( 30 ) begins and within the drive ( 15 ) ends.

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